CVE detail
CVE-2021-41524
While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request processing, allowing an external source to DoS the server. This requires a specially crafted request. The vulnerability was recently introduced in version 2.4.49. No exploit is known to the project.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 13.9 · diversity 8.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
3 source links · newest first
Users are urged to immediately patch an Apache HTTP Server zero-day vulnerability that has been exploited in the wild. More than 100,000 servers appear to be exposed to attacks.
newswww.securityweek.comOct 6, 2021, 11:06 AM- Apache patch a zero-day flaw exploited in the wildSecurity Affairs
Apache has addressed two vulnerabilities, one of which is a path traversal and file disclosure flaw in its HTTP server actively exploited in the wild. Apache has rolled out security patches to address two flaws, including a path traversal and file disclosure issue in its HTTP server that is actively exploited in the wild. The […]
newssecurityaffairs.comOct 5, 2021, 5:15 PM - [Updated, again] Apache fixes zero-day vulnerability in HTTP ServerMalwarebytes Labs
The Apache HTTP Server 2.4.49 is vulnerable to a flaw that allows attackers to use a path traversal attack to map…
newswww.malwarebytes.comOct 5, 2021, 5:00 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
Related records
Similar CVEs
6 related CVEs with shared weakness or product evidence
- CVE-2021-34798CVSS 7.5 · High
Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.
- CVE-2021-44224CVSS 8.2 · High
A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy d…
- CVE-2021-31618CVSS 7.5 · High
Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 proto…
- CVE-2021-26690CVSS 7.5 · High
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial O…
- CVE-2020-13950CVSS 7.5 · High
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-…
- CVE-2021-44790CVSS 9.8 · Critical
A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an expl…